https://groups.google.com/forum/#!searchin/netty-ko/proxy/netty-ko/_v_SvKQQVxI/XoJdV1J8zTsJ
https://groups.google.com/forum/#!topic/netty-ko/Ils-0UiPbl0
https://groups.google.com/forum/#!topic/netty-ko/K5z7C35i_0k
## db connection
https://groups.google.com/forum/#!topic/netty-ko/msa9j_jlEKQ